From 43ce115ca91d34af1640f9ece2e5526e44dd2c7e Mon Sep 17 00:00:00 2001
From: Alexander Ried <ried@mytum.de>
Date: Sat, 22 Oct 2016 02:10:38 +0200
Subject: [PATCH] stdenv.hasLicense: ? supports nested lookup

this avoids one copy of the attrset
---
 pkgs/stdenv/generic/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/stdenv/generic/default.nix b/pkgs/stdenv/generic/default.nix
index 372fd3cfa52..f969d246ff5 100644
--- a/pkgs/stdenv/generic/default.nix
+++ b/pkgs/stdenv/generic/default.nix
@@ -44,7 +44,7 @@ let
       throw "whitelistedLicenses and blacklistedLicenses are not mutually exclusive.";
 
   hasLicense = attrs:
-    builtins.hasAttr "meta" attrs && builtins.hasAttr "license" attrs.meta;
+    attrs ? meta.license;
 
   hasWhitelistedLicense = assert areLicenseListsValid; attrs:
     hasLicense attrs && builtins.elem attrs.meta.license whitelist;